Ratchet-drill.



F; PISHAPf BATCHET DRILL. vAPPLICATION FILED NOV. 6 i916,

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' i ihlllllElU SATB@ FRANK r; SHARP, or OAKLAND, cerimoniale..

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Y`To all whom it may concern:

Berit known that LFRANK P. SHARP, a

-citizen'- of` the United States, residing at Oakland, in vthe county'of Alameda, `.State .of California, have .invented a new and usefulRatchet-Drill, of which the following is afspecification in such full'and clear terms as will enable those skilled in the art to construct anduse the same.

This invention `relates to a ratchet drill, an object of which is toproduce a drill capable of being turned in a Avery short space by reasonof the fact that the ratchet holds by friction and thereby enables thedrill to be turned with very short strokes.

Another object of the invention is to produce a handle fora drillcapable of having either the drill head inserted or a socket wrenchholding head inserted therein at the will of the operator.

Another object of the invention is to provide the drill feed screw capwith a friction guide rod which will hold the feed screw cap in anygiven adjustment while the drill is being used, and which will supportit more rigidly when partly extended.

Another object of the invention is to provide an oscillating cam or pawlwhich will frictionally engage to the wrench or drill head, and whichmay be easily assembled when it is desired to change from the socketwrench to the drill head.

Another object of the invention is to provide the revoluble head whichcarries the drill or wrench with a series of shallow flutes which willinsure the proper frictional engagement of the cam and revoluble headwhile at the same Vtime making it possible to turn the head withexceedingly short strokes, each flute being only about one sixteenth ofan inch wide and about one sixtyfourth of an inch deep, and the flutesare spaced apart so as to provide a bearing for the head in the recessin which it is placed.

An embodiment of the invention is shown in the drawing in which the samereference numeral is applied to the saine portion throughout, but I amaware that there may be many modifications thereof within the scope ofthe appended claims.

Figure l shows a side elevation of the drill with a portion of thehandle broken away for the purpose of illustration.

Fig. 2 is a. side elevation ofthe handle of the drill, the drill headand operating end Speccaton of Letters Patent.

'i Application filed November 6, 1916. Serial No. 129,86*?.

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o f the handle being shown in vertical section.

Fig.' 3 is aplan view of the operating end fof the handle with thedrillhead retaining plate broken for the purpose of illustration."

Fig. l is a bottom plan view of the drill head and handle as shown inFig. 1, and

Fig. 5 `is a vertical sectional view of the socket wrench operatinghead.

rlhediaill consistsofV a handleY l with an enlarged operating head 2.The head 2 is bored to receive the drill head 3, a `platea with aplurality of screws 5 holdin g the drill head in place in the head 2 ofthe handle. The outside of the drill head is cylindrical and in a pocket6 of the head 2 there is an oscillating or pivoted cam 7, said cam beingso shaped as to allow the head 3 to slip when the cam is moved in onedirection, while it will carry the head 3 along with it when it is movedin the opposite direction. The cam or pawl has an arm 8 upon which bearsa spiral spring 9 which holds the cam in engagement with the flutes 3 onthe ontw side of the head 3. In order to feed the drill the head 3 isprovided with a threaded shank 10 over which a knurled sleeve 11 isscrewed. rlhe spring 9 has a straight portion which extends into a holein the cam to hold it while the cam is being assembled. The knurledsleeve l1 is screwed on a short stud 12 of the cap 13 which forms thebearing for the end of the shank. The stud 12 has integrally therewith arod 14: which is split at 15 so that it will bear tightly on the insideof the shank 10, the object being to hold the shank 10 and sleeve 11 ina given adjustment when set by the user. In order to prevent the sleevel1 from screwing ofi' of the short stud 12, a pin 16 is driven through ahole'in the stud, one half of said pin being seated in a notch in theupper end of the sleeve 11. The drill head has an opening 18 in itsunderside to receive the shank of the drill to be used therewith. `Whenit is not desired to use the drill but is wanted as a socket wrench thehead shown at 22 is substituted for the head 3 in the handle, the plate4.- heing removed to take ont the drill chuck after which the socket 22can be inserted. This head has a liange 21 upon which the cam 7 bearsthe same as it does upon the outside of the head 3.

The operation of the drill is as follows Assuming a drill bit to beplaced in the opening 1,8, `the sleeve ll is screwed out against somefixed object,its upper end.V bearing upon the same and the drill isrotated with short or long strokes of the handle l, and as the drillgoes into the material, the sleeve 1l is rotated by hand or by insertinga rod in one of the holes 23, 2li,

u in its upper end until the drill again bears -is completed.

tightly upon the material ,being cut and the same proceeding iscontinued until the hole Having thus described my invention what I claimas new and desire to. secure by Let- Copies of this patent maybevobtaned for c splitA at vone end and bearingifrictionally upon theinside of theV hollow threaded shank. Y Y a 2. A device of the:Character described comprising the combination of a handle with" anenlarged head, having a cylindricalV seat therein, aV revoluble head vinContact with said seat andhaving a plurality fof' shallow separated.iutes, a pivoted cam in the handle head, the face of Which contactswith andis of substantially the same curve as said flutes onthe flutedhead,;a VHat arm Carried byv theeam and a spiral spring supported byAthe cam and bearing'on the flat 1^ arm to hold the fluted` head. 1

In testimony whereof I have hereunto' set my hand this 27th dayofOctoberA, D., 1916. rt FRANK VP. SHARP.

ve cents eaclluby addressing'rthe Commissioner of Patents. Washington,D. C. Y

